1 files changed, 83 insertions, 0 deletions
diff --git a/plugins/sudoers/b64_decode.c b/plugins/sudoers/b64_decode.c
new file mode 100644
index 0000000..736df28
--- /dev/null
+++ b/plugins/sudoers/b64_decode.c
@@ -0,0 +1,83 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2013-2018 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include "sudoers.h"
+
+/*
+ * Derived from code with the following declaration:
+ *	PUBLIC DOMAIN - Jon Mayo - November 13, 2003 
+ */
+
+static const unsigned char base64dec_tab[256]= {
+    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+    255,255,255,255,255,255,255,255,255,255,255, 62,255,255,255, 63,
+     52, 53, 54, 55, 56, 57, 58, 59, 60, 61,255,255,255,  0,255,255,
+    255,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
+     15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,255,255,255,255,255,
+    255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+     41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,255,255,255,255,255,
+    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+    255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+};
+
+/*
+ * Decode a NUL-terminated string in base64 format and store the
+ * result in dst.
+ */
+size_t
+base64_decode(const char *in, unsigned char *out, size_t out_size)
+{
+    unsigned char *out_end = out + out_size;
+    const unsigned char *out0 = out;
+    unsigned int rem, v;
+    debug_decl(base64_decode, SUDOERS_DEBUG_MATCH);
+
+    for (v = 0, rem = 0; *in != '\0' && *in != '='; in++) {
+	unsigned char ch = base64dec_tab[(unsigned char)*in];
+	if (ch == 255)
+	    debug_return_size_t((size_t)-1);
+	v = (v << 6) | ch;
+	rem += 6;
+	if (rem >= 8) {
+	    rem -= 8;
+	    if (out >= out_end)
+		debug_return_size_t((size_t)-1);
+	    *out++ = (v >> rem) & 0xff;
+	}
+    }
+    if (rem >= 8) {
+	    if (out >= out_end)
+		debug_return_size_t((size_t)-1);
+	    *out++ = (v >> rem) & 0xff;
+    }
+    debug_return_size_t((size_t)(out - out0));
+}